Is there a reason not to copy the file once the test has already started (using the agent)? If not, try SYS_EXECUTE with dos COPY. Mapping a network drive that you can use from DOS can be accomplished more than one way, but I use a vbs script which executes whenever anyone logs in (on startup).
Chris R Mead
The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.